Calculate how many bags of cement, wheelbarrows of sand, and gravel you need. Common African construction mix ratios included.
Whether you're casting a floor slab in Lagos, building a column in Nairobi, or laying blocks in Accra, getting the right quantities of cement, sand, and aggregate saves money and ensures structural integrity. This calculator uses standard volumetric ratios used across African construction to determine exact quantities.
A mix ratio of 1:2:4 means 1 part cement, 2 parts sand, and 4 parts aggregate by volume. The total parts are 7, so cement constitutes 1/7th of the dry volume. Since dry materials compact when mixed with water, we apply a bulking factor of 1.54 (the dry volume is about 54% more than the wet/final volume) to calculate actual materials needed.